Lateral-resistance device



c. w. TODD v LATERAL RESISTANCE DEVICE Filed Aug. 27, 192s `lll "ll f /4 f/////////////////// INV TOR `Patented Oct. 3Q, 1928.

CHARLES TODD, OF SCHENECTADY, NEW YORK.

La'rERAL-Rnsrsfrmcn DEVICE.

Application filed August 27, 1926'. Serial No. 131,937.

M y invention relates to lateral resistance devices, of the geared roller type, for railroad trucks, and has for an object the provision of a simplified constructionladapted to exert initially a low resistance, and increasing to a higher constant resistance.

I have observed that, for most main line operations, where the degree of curvature of the track is low, a lateral resistance device capable of exerting a low initial resistance, will protect the wheel hubs from the excessive wear that results, when resistance devices exerting a high initial resistance are used. Accordingly,y I have devised a lateral resistance device of the geared roller type, which will exert a low initial resistance, and increasing to a higher constant resistance, for sharper curves. The improvement claimed is hereinafter fully set forth.

In the accompanying drawing: Figure 1 is a top plan view, with portions broken away, illustrating my improvement applied to a four wheeled locomotive truck of the ordinary construction; Fig. 2, a transverse vertical section, on the line w v@c of Fig. 1; Fig. 3, a side view of one of the roller plates, illustrating the contour of the rolling surface; and, Fig. 4,

a diagram showing the resistance character` istics of the truck, shown in Figs. 1 and 2.

M v invention is herein exemplified as appliedlin a four wheeled locomotive truck, of the swing or lateral motion type,in which, as in present'pr-actice, a frame, 10, is supported through the intermediation of springs, v11, on the journall boxes,12, of axles, 1S, on which the truck wheels, 14, are secured. 'A swing frame or bolster support, 15, extends from one to the other of the side members of the truckJ frame, to ends.

The weight carried by the truck is primarily applied 'thereto through a floating or swing which it is rigidly secured at its I bolster, 15a, which is provided with a centre the teeth, 20, of upper and lower roller seats,

' 21. The seats are in the form of corresponding alternately oppositely inclined racks. The roller surface of each rack comprisestwo different arcs and opposite straight inclined tangents. I have found that the desired resistl ance characteristics may be obtained where the centre arc, a-b, has the same radius las the roller, 17, and the arcs, a-c, and b-d, have a greater radius, and continue from the arc, @-5. The portions c-e' and racks, are tangent to the adjacent arcs.

From the foregoing, it will be apparent that my improved resistance device will function initially with a low resistance, and thereafter increasing to a, higher constant resistance. The resistance characteristics of the device are clearly illustrated by the line g, 7L, z', of Fig. 4, the curve, g, It, representing the initial resistance, and the line L-c', the filial constant resistance. e

I'claim as my invention and desire to secure by Letters Patent:

1. A roller seat forlateral resistance devices for railroad trucks, said seat having alternately reversed toothed inclines on its bearing surface, the inclines being substantially straight at the top and curved at the bottom.

2. A roller seat for lateral resistance devices for railroad trucks, said seat having alternately reversed toothedinclines on its bearing surface, each incline extending from the bottom upwardly, and comprising first a curve, then a curve of greater radius than the first curve, and then a straight incline.

3. In a lateral resistance device for railroad trucks, the combination of a truck frame; a

. between the upper and lower seats, and having teeth meshing with the teeth on the seats, the toothed surfaces of the seats being alternately reversed inclines, and the inclines being substantially straight at the top, and curved at the bottom.

4. In a lateral resistance device for railroad trucks, the combination of a truck frame; a vfloating bolster; an upper toothed roller seat,

on fthe bolster; a swing frame for .the bolster; a lower toothed-roller seat.; a roller, disposed between the upper and lower seats, and having teeth meshing with the teeth on the seats, the toothed surfaces of the seats being alternately reversed inclines, each incline extending from the bottom upwardly, and comprising, first, a curve, then, a curve of greater radius than the first curve, and then a straight incline.

CHARLES W. TODD.

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